The tempature switch for the fan will be located on the radiator tank, most likly near the bottom or mid way up. It will have two wires in most cases.

With the key on but the car not running, connect these two wires together. If the fan runs, replace this radiator switch.

If the fan does not run, pull the connectors apart going to the fan itself. Jump power and ground to each of these two wires. If the fan does not run, the problem is the fan. If it does run, the problem is most likely the relay for this fan

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That an electrical short. The fan relay or the fan switch sounds like the troublemaker. when the ignition is off, the fan shut down.The relay is an "on & off" switch for the fan.If the relay is "sticking" in the on position, the fan will continue to run until the battery dies. Same scenario if your Polo is equipped w/ a fan switch. If the switch is stuck on, the fan runs. There's the short. get someone u trust to ck that out. Good Luck, happens all the time.

There a a few tests you can conduct here. Firstly, put power directly to your fan(s) Run two new wires directly from the battery to the + and - of the fan motor. Be careful doing this, as there is a risk of shorting the battery to earth. Maybe connect up the fan end before touching the wires onto the battery terminals. This will prove if your fans actually work. They should spin up to speed. Next, test the fan thermostat. There should be a terminal connection somewhere. One side of the fan wires would be connected to the thermostat. You will likely need a voltmeter to do this test. The thermostat is just a switch that should operate after a certain temperature is reached. Normally you would have to remove the thermostat from the car engine to test it, but it might be possible to test it when it's still installed. Next, test or replace the radiator thermostat. If coolant is unable to flow through the radiator after the engine warms up, you will get overheating. After a short warmup period, the radiator thermostat should open and allow coolant to flow through the engine block. Next, when the engine is running, check the exhaust pipe for water. Some water might be normal, until the engine is hot, but if a lot of water is evident, then maybe the block has been cracked. Best test for that is a cylinder compression test, with a compression gauge. Lastly, please do something positive about this. There is a great danger you will crack the engine block, especially if you are adding cold water/coolant to a very hot engine. Remember: does the fan run off direct power? Is the fan thermostat switching correctly? Does the radiator thermostat work correctly? Is the water pump working correctly? Hope this helps. Regards,

Check these parts...........
First check the TEMPERATURE/RADiATOR FAN SWiTCH, it is connected on ur RADiATOR, w/ 2 wires connected to it, at certain temperature the switch turns ON ur FAN MOTOR, by disconnecting it and JUMP/SHORT the 2 wires FAN MOTOR should run, even when u just turn on the ignition!
If the FaN runs, u got temp switch prob and needs to replace, If the fan didn't run when u shorted the wire in the switch.
Check the RELAY, located in the ENGiNE FUSE box, pull out the relay and replace it w/ another relay, while ur 2 wires in the temp switch is on and ur ignition is in the ON position, when the relay clicks and the fan runs, u have a GOOD relay, if not u have to replace the RELAY!
Hope that explains everything!
Taah!

well you see the relay is built to switch a higher current circuit using a smaller current. it is a safety hazard as using just a toggle switch will allow too much current to flow thru the circuit. you should replace the relay. now if after you replace the relay the fans dont work but the fans are good(ran power wire directly to fan for testing purposes) then as a temporary measure you wire a switch to Control thr relay(relay actually handles the fan current). find the fan relay. it should have 5 pins. on the case of the relay there should be a diagram.

the numbering should be the same.

using an ohm meter checkthe relay socket pin86 with red lead, black lead connected to ground. if zero ohms, then that is ground and pin85 of relay socket is +. pin30 should read 12 volts with meter, run wire from here to one side of a toggle switch located near steering wheel so you can access it when you start car. other side of toggle switch runs to pin85.with the small wires into the relay socket still in place, plug in relay. throw toggle switch to on and if everythings connected, fans should come on.

A simple test would involve disconnecting the fan switch while the fan is on. If the fan then stops the switch has failed. If the fan continues to run remove the relay , if the fan then stops the relay has failed. Various inputs/outputs at the relay should be confirmed to be 100% certain something strange isn't going on. Above all be careful of the fan itself , if it's running obviously but if it's not it could start during repair

Check the coolant temperature switch. You should have 12V on one side of the switch. If you jumper the two wires in the switch connector, your radiator fan should run with the ignition switch on. If it runs, replace the coolant temperature switch.

most has a temp sending unit in thromstat housing, should be two sending units on it,one is cooliant temp and one is for the fan, try to replace ,try to unplug one at a time to see which one changes the temp gauge or fan ,hope to help you,robert b.

First if you coolant is boiling over you may have one on the following problem, bad thermostat-stuck closed. bad water pump bad radiator fan or fan switch or antifreeze leak-bad hose etc. Bad head gasket. Contact if you need more help,thanks for using FIX YA